| In this paper,a new type of round steel pipe pier is designed.It can be used as a short column alone,mainly for its bearing capacity,energy dissipation performance and ductility.It can also be used as an upper and lower member of a monolithic pier.Not only can the above performance be achieved,but also the damaged part can be replaced.The significance of the paper is to further explore the internal structure of the new round steel pipe piers,which makes the piers achieve ideal results in terms of bearing capacity,energy dissipation performance and ductility.When the pier is subjected to an earthquake disaster or other forms of damage,the damage and replacement of the entire pier is avoided,and only a part of it is replaced to maintain the normal function of the pier.The experimental and finite element simulation methods were used to study the mechanical behavior of steel pipe piers under axial force.Choose whether there are wall stiffeners,low yield point steel stiffener type,low yield point steel strength,low yield point steel plate height and other parameters to change,design 4 sets of 14 round steel pipe pier specimens,and 14 The axial steel pipe specimens were subjected to axial compression test.The research results show that the bearing capacity and energy dissipation performance of the round steel tubular pier specimens are better under the axial compression state,and the ductility of the specimens also performs better.After the wall stiffener is set,the bearing capacity of the test piece rises and the ductility coefficient of the test piece slightly decreases.Different types of stiffeners on the yield plate have improved ductility and energy consumption performance of the test piece,but the effect is not obvious;The strength of the low yield point steel plate is different,and the ductility and load bearing capacity are also different,which is related to the internal structure of the test piece.The bearing capacity and energy consumption performance of the test piece were improved at different heights of the low yield point steel plate.The ductility coefficient decreased in addition to the first test piece,and the other two increased.The ultimate bearing capacity decreases with the decrease of the height ofthe low yield point steel plate,and the ductility coefficient increases with the decrease of the height of the low yield point steel plate.In this paper,the test curve and the load-displacement curve obtained by finite element simulation are compared and analyzed.Except the curves of III-B and III-C are inferior,the other curves are more consistent.Based on the above finite element model,expand the parameters of the test piece,design 66 components for numerical simulation,and further study the eccentricity,stiffened plate thickness,yield plate thickness,presence or absence of wall stiffeners,low yield point steel stiffener type,low The influence of parameters such as yield point steel plate strength and low yield point steel plate height on the compression performance of round steel pipe piers.The research results provide a large number of experimental data and design suggestions for the seismic design and energy dissipation capacity of the steel pier structure,and give a simplified calculation formula for the bearing capacity,which provides a theoretical basis for the application of such steel pier structure engineering. |
